Peak 2710 Occurrence, Sheenjek Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Peak 2710 Occurrence	Occurrence
Sheenjek Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

See MAS/MILS Sequence # 0020330006 (USBM, 1995)
Location: Located about 2 mi (3.2 km) southwest of hill 2710, midway between Rapid River and Sunaghun Creek, between two localities shown in Barker (1981, p.65 and 76); located to within 3000 ft (915 m).
Geology: Locally high-grade lenses of Cu sulfides, sphalerite, galena and magnetite in thermally altered calcareous argillite intruded by rhyolite porphyry dikes and sills. Fe and Ma staining are abundant in contact zone. Mineralization can be traced 75 ft (23 m) in rubble. Nearby rocks include Paleozoic? black phyllite, maroon and green argillite, calc argillite, quartzite and limestone (Neruokpuk Fm.?), and are locally malachite or manganiferous stained (Barker, 1981, p. 64-68, 75-9).
Workings: 'Manganiferous' granite contains <300 ppm Cu, 2.0% Zn, 1500 ppm Pb and 6 ppm Ag (Brosge and Reiser, 1968). Skarn with quartz, magnetite and sulfides contains 8.6% Cu, 8700 ppm Pb, 3800 ppm Zn, 43 ppm Ag. Gossan with malachite contains 8 ppm Mo, 767 ppm Sn, 102 ppm Be, 5500 ppm Cu, 1.1% Pb, 1.2% Zn, 84 ppm Ag and 160 ppm U. Hornfelsed argillite contains 55.6 ppm Th, 14.4 ppm U. Soils contain up to 290 ppm Cu, 4100 ppm Pb, 6400 ppm Zn, 0.9 ppm Ag (Barker, 1981, p. 78).

Commodities (Major) - Cu, Zn; (Minor) - Ag, Mo, Pb, Sn, Th, U
Development Status: No
Deposit Model: Lode; hornfels and sulfide mineralization related to emplacement of rhyolite por

Other Databases

Link to USGS - Alaska:	CO012

Other Regions, Features and Areas containing this locality

References